ParticleSystem.ShapeModule.texture

Description

Selects a texture to be used for tinting particle start colors.

using UnityEditor;
using UnityEngine;

public class ExampleClass : MonoBehaviour
{
    private ParticleSystem ps;
    public float alphaThreshold = 0.0f;
    public bool colorAffectsParticles = true;
    public bool alphaAffectsParticles = true;
    public bool bilinearFiltering = false;

    void Start()
    {
        ps = GetComponent<ParticleSystem>();

        var main = ps.main;
        main.startSpeed = 0.0f;
        main.startSize = 0.5f;
        main.startLifetime = 1.0f;

        var emission = ps.emission;
        emission.rateOverTime = 500.0f;

        var shape = ps.shape;
        shape.shapeType = ParticleSystemShapeType.Circle;
        shape.radius = 6.0f;
        shape.texture = AssetDatabase.GetBuiltinExtraResource<Texture2D>("Default-Particle.psd");
    }

    void Update()
    {
        var shape = ps.shape;
        shape.textureClipThreshold = alphaThreshold;
        shape.textureColorAffectsParticles = colorAffectsParticles;
        shape.textureAlphaAffectsParticles = alphaAffectsParticles;
        shape.textureBilinearFiltering = bilinearFiltering;
    }

    void OnGUI()
    {
        float y = 120.0f;
        float spacing = 40.0f;

        GUI.Label(new Rect(25, y, 140, 30), "Alpha Threshold");
        alphaThreshold = GUI.HorizontalSlider(new Rect(165, y + 5, 100, 30), alphaThreshold, 0.0f, 1.0f);
        y += spacing;

        colorAffectsParticles = GUI.Toggle(new Rect(25, y + 5, 200, 30), colorAffectsParticles, "Color Affects Particles");
        y += spacing;

        alphaAffectsParticles = GUI.Toggle(new Rect(25, y + 5, 200, 30), alphaAffectsParticles, "Alpha Affects Particles");
        y += spacing;

        bilinearFiltering = GUI.Toggle(new Rect(25, y + 5, 200, 30), bilinearFiltering, "Bilinear Filtering");
        y += spacing;
    }
}